The same as starting a line of dogs bud when you put the hob off your old line on to your Jill's keep Jill's and line the same hob back over his daughters then again for his granddaughters then bring a different hob in to freshen the blood so it's not too tight keep a hob and then breed it in to your Jill's then you can start mixing cousins aunts nephews just don't breed to close like full litter siblings